A distinguishing feature of cardiac blood flow is the presence of vortices, 1,2 which are ring-shaped regions of rotating flow motion. Vortices are well-known entities in fluid dynamics, characterized ...

Much of the United States is currently in the grip of a polar vortex, a system of dense air producing plummeting temperatures and swathes of freezing weather, bringing some parts of the country to a ...

Forecasters are warning that the breakdown of the polar vortex high above the Arctic will not bring relief from winter, but instead lock in a brutal stretch of cold for millions across North America ...